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1. The lounge is for the CodeProject community to discuss things of interest to the community, and as a place for the whole community to participate. It is, first and foremost, a respectful meeting and discussion area for those wishing to discuss the life of a Software developer.
The #1 rule is: Be respectful of others, of the site, and of the community as a whole.
2. Technical discussions are welcome, but if you need specific programming question answered please use Quick Answers[^], or to discussion your programming problem in depth use the programming forums[^]. We encourage technical discussion, but this is a general discussion forum, not a programming Q&A forum. Posts will be moved or deleted if they fit better elsewhere.
3. No sys-admin, networking, "how do I setup XYZ" questions. For those use the SysAdmin[^] or Hardware and Devices[^] forums.
4. No politics (including enviro-politics[^]), no sex, no religion. This is a community for software development. There are plenty of other sites that are far more appropriate for these discussions.
5. Nothing Not Safe For Work, nothing you would not want your wife/husband, your girlfriend/boyfriend, your mother or your kid sister seeing on your screen.
6. Any personal attacks, any spam, any advertising, any trolling, or any abuse of the rules will result in your account being removed.
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Please respect the community and respect each other. We are of many cultures so remember that. Don't assume others understand you are joking, don't belittle anyone for taking offense or being thin skinned.
We are a community for software developers. Leave the egos at the door.
cheers,
Chris Maunder
The Code Project | Co-founder
Microsoft C++ MVP
modified 16-Sep-19 9:31am.
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I recently implemented a small service to handle uploads from the browser to our "media server" (rather legacy, don't ask) and on our dev server, no problem. On the actual media server box, I kept getting the dreaded no-access-control-allow-origin header.
Fussed with all the IIS settings and web.config settings to no avail.
Tested vanilla POST calls, all passed CORS without issues.
Learned about "simple requests" which multiform is one of and which don't do an OPTIONS preflight request.
Found an obscure post that people were getting this CORS error on ngnix when the file size was too large.
Tried uploading a a 1K file, and it worked!
Discovered that if the file size was somewhere between by 31K and 67K test files, the larger one failed.
Discovered that if I removed the docInfo parameter:
public IActionResult Upload([FromForm] DocumentUpload docInfo)
The endpoint was hit, no CORS error.
Was thinking, geez, what is .NET 6 doing? Do I have to parse the multiform data myself?
Found a post on the topic that mentioned this code:
var form = ControllerContext.HttpContext.Request.Form;
Tried that and to my horror, it threw an UnauthorizedAccessException that c:\windows\temp\[temp file] is not accessible.
Googled, added IIS AppPool\[my application pool] as a user to c:\windows\temp.
AND IT WORKED.
Unbelievable. An unauthorized access exception results in the browser giving me a CORS error!
This took all week to figure out, spending probably 6 hours a day on it. 
And the small <30K file uploads worked without problems because it didn't require creating a temp file for the stream content.
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I have no idea what you're talking about  other than the punch line, which seems to be that this house of cards is shite at generating error messages that are useful for debugging.
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Greg Utas wrote: seems to be that this house of cards is shite at generating error messages that are useful for debugging
It's ALWAYS been this way. SQL Server is the worst.
".45 ACP - because shooting twice is just silly" - JSOP, 2010
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You can never have too much ammo - unless you're swimming, or on fire. - JSOP, 2010
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When you pry the gun from my cold dead hands, be careful - the barrel will be very hot. - JSOP, 2013
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I know what an SQL server is but had no idea the post was talking about one.  
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Hmmm,
Marc Clifton wrote: Googled, added IIS AppPool\[my application pool] as a user to c:\windows\temp.
AND IT WORKED.
Are you sure that allowing your application pool to use global %TEMP% is a good idea? Everybody can read/write to that location. It's probably more secure if your application pool uses the %USERPROFILE% temp path.
I'm not an IIS expert but I think a better fix would be loading the user profile[^] for the application pool identity. You should dig around for a setting to enable that. This setting will populate your environment variables and should change your temp folder to the %USERPROFILE% temp.
Just a security recommendation. 
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I've had something similar before with something going wrong on the API, but the browser showing it as a CORS error. There's a whole flow that happens and I assume that the initial CORS request fails due to whatever is wrong in the background and the browser then just shows that CORS failed.
On a ASP.Net project I had to put a if statement in for handling CORS Options requests from Angular because it was calling the method like it would have with a normal request. Maybe just a weird setup in my case. With .Net Core I don't think the options request activates the breakpoints, although it looks like you can with some middleware: https://www.codeproject.com/Questions/5162494/Currently-I-am-working-on-angular-and-web-API-NET
Complete Guide to CORS
modified 5hrs 5mins ago.
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Fantastic & interesting post & great detective skills. 
Marc Clifton wrote: Googled, added IIS AppPool\[my application pool] as a user to c:\windows\temp.
I'm filing this one away in my brain for later use.
That is a crazy situation but I totally believe it because of horrors I've seen with similar & IIS & CORS etc.
BTW, was this change needed only on your dev box or did you have to make that change on the Server also?
This is just crazy to me. Can you post the link where you found that solution? Very interesting and quite terrible.
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One other piece of configuration you need to do: Configure Storage Spaces to run automatically and scrub the temp folder structure after 30 days. IIS is atrocious when it comes to cleaning up after itself.
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I'm on a 5 year plan to move to Canada, which hubby and I will do assuming things continue to go south here in the states. Living in Canada will be like moving from the meth lab to the apartment above the meth lab, but at least we'll be able to breathe. Learning Canadian English should be fun. I imagine there are lots of synonyms for hockey.
Do you think getting this tattoo somewhere visible will help streamline the admission process?[^]
To err is human. Fortune favors the monsters.
modified 8hrs 5mins ago.
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Only if it's a matching pair, and on the genitalia ...
"I have no idea what I did, but I'm taking full credit for it." - ThisOldTony
"Common sense is so rare these days, it should be classified as a super power" - Random T-shirt
AntiTwitter: @DalekDave is now a follower!
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I think that claiming that you are a persecuted minority refugee from a third world country would help more. 
Given the way many Canadians view the US, this may actually work. 
Freedom is the freedom to say that two plus two make four. If that is granted, all else follows.
-- 6079 Smith W.
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We don't think Americans are being persecuted; we're afraid of them.
"Before entering on an understanding, I have meditated for a long time, and have foreseen what might happen. It is not genius which reveals to me suddenly, secretly, what I have to say or to do in a circumstance unexpected by other people; it is reflection, it is meditation." - Napoleon I
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Please note:
- I never said that Americans are persecuted minorities.
- I never even said that codewitch is part of a persecuted minority.
- I said that given the way many Canadians think of the US, making the claim might be of use.
Freedom is the freedom to say that two plus two make four. If that is granted, all else follows.
-- 6079 Smith W.
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To ask about a search (7)
// TODO: Insert something here Top ten reasons why I'm lazy
1.
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Nice one!
"I have no idea what I did, but I'm taking full credit for it." - ThisOldTony
"Common sense is so rare these days, it should be classified as a super power" - Random T-shirt
AntiTwitter: @DalekDave is now a follower!
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My word but it's quiet today ... I'd better take it ...
To ask
about RE
a search QUEST REQUEST
Nice clue!
"I have no idea what I did, but I'm taking full credit for it." - ThisOldTony
"Common sense is so rare these days, it should be classified as a super power" - Random T-shirt
AntiTwitter: @DalekDave is now a follower!
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Thank you.
Quote: My word but it's quiet today
Too right.
And; spot on, you are up on Monday.
// TODO: Insert something here Top ten reasons why I'm lazy
1.
modified 7hrs ago.
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Monday will be even quieter, it's "All American Get Drunk And Shoot Up The Neighborhood* Day"
* Maybe bullets, maybe fireworks, probably both - depends on where in the US you are.
"I have no idea what I did, but I'm taking full credit for it." - ThisOldTony
"Common sense is so rare these days, it should be classified as a super power" - Random T-shirt
AntiTwitter: @DalekDave is now a follower!
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You just don't wait long enough for this side of the pond to get our coffee so we can think 
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I assumed you'd all make it a long weekend with monday off - it was so quiet round here, you could hear a mozzie fart ...
"I have no idea what I did, but I'm taking full credit for it." - ThisOldTony
"Common sense is so rare these days, it should be classified as a super power" - Random T-shirt
AntiTwitter: @DalekDave is now a follower!
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I didn't post as I've done one this week
Life should not be a journey to the grave with the intention of arriving safely in a pretty and well-preserved body, but rather to skid in broadside in a cloud of smoke, thoroughly used up, totally worn out, and loudly proclaiming “Wow! What a Ride!" - Hunter S Thompson - RIP
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Fellini Félin - Fiore & I[^]
A bit of a unique SOTW this week... In that I don't even like it all that much myself 
It's a poppy song that's not hard to listen to, but the singer sounds a bit whiny for my tastes.
However, the second half is so catchy I just have to listen to it again... And again, and again, and again...
Humming and whistling along to it, I dare you not to
I found it while Spotify was just playing random songs while working late one evening.
Can't find much about Fellini Félin.
I think it's just one guy from France.
So far he's released a couple of singles and EPs.
Now if you'll excuse me, I'm going to listen to it again
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Didn't mind it, nice background music when having dinner with friends.
// TODO: Insert something here Top ten reasons why I'm lazy
1.
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